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Horseshoe crab blood is extremely sensitive to infection and coagulates in minutes when microbes are present. This coagulation serves as a marker to test if a vaccine or an instrument is sterile. Mammalian blood can do it too but it takes days. There is a synthetic substitute but it is not considered cost-effective. How Horseshoe Crab Blood Saves Millions Of Lives Blue moon. Currently, the most common definition is the second full moon in a calendar month. This definition has no astronomical significance and is of no particular use. It came from a mistaken understanding of a definition which made a blue moon the third full moon in a season of four full moons. This was important in keeping named full moons in their correct seasons. Blood moon. A rather dramatic term for a totally-eclipsed full moon. Sunlight can’t reach the Moon directly when the Earth is blocking it. However, some sunlight is refracted through the Earth’s atmosphere. The blue part of sunlight scatters and the reddish part travels through the atmosphere to the Moon. It’s then reflected back to the Earth and can look somewhat like blood. In general, the colour we see on the eclipsed Moon depends on the state of the Earth’s atmosphere.
Horseshoe crab blood has a lot of good medical purposes. First off horseshoe crab blood contains hemocyanin which Carrys the oxygen through the blood. They also have amebocytes which play a similar role to WBCs function in human bodies. These amebocytes identify and congeal around the foreign invader and Trap it inside a gel like seal that stops it from spreading. With that being said, scientists capture horseshoe crabs and take 30% of their blood (this is to ensure that the crab still has a substantial amount that they can resupply themselves). Scientists developed an extract that utilizes horse crab blood for the amebocyte purpose. 45 mins of exposure to the crabs blood is enough to reveal endotoxins from gram negative bacteria that would have otherwise gone undetected. Also, these amebocytes are sensitive enough that they will recognize minute invader within a big area, the comparison was “the equivalent size of a grain of sand in a swimming pool” so basically, the crabs blood can find that needle in the haystack.